Ryo Takakura 01b9743119 printk/panic: Allow cpu backtraces to be written into ringbuffer during panic ...

[ Upstream commit bcc954c6caba01fca143162d5fbb90e46aa1ad80 ]

commit 779dbc2e78d7 ("printk: Avoid non-panic CPUs writing
to ringbuffer") disabled non-panic CPUs to further write messages to
ringbuffer after panicked.

Since the commit, non-panicked CPU's are not allowed to write to
ring buffer after panicked and CPU backtrace which is triggered
after panicked to sample non-panicked CPUs' backtrace no longer
serves its function as it has nothing to print.

Fix the issue by allowing non-panicked CPUs to write into ringbuffer
while CPU backtrace is in flight.

Fixes: 779dbc2e78d7 ("printk: Avoid non-panic CPUs writing to ringbuffer")
Signed-off-by: Ryo Takakura <takakura@valinux.co.jp>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240812072703.339690-1-takakura@valinux.co.jp
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-08-29 17:35:53 +02:00

..

bpf

bpf: Fix a kernel verifier crash in stacksafe()

2024-08-29 17:35:45 +02:00

cgroup

cgroup/cpuset: Prevent UAF in proc_cpuset_show()

2024-08-03 08:59:12 +02:00

configs

hardening updates for 6.10-rc1

2024-05-13 14:14:05 -07:00

debug

kdb: Use the passed prompt in kdb_position_cursor()

2024-08-03 09:00:59 +02:00

dma

dma: fix call order in dmam_free_coherent

2024-08-03 09:01:01 +02:00

entry

entry: Respect changes to system call number by trace_sys_enter()

2024-03-12 13:23:32 +01:00

events

perf/bpf: Don't call bpf_overflow_handler() for tracing events

2024-08-29 17:35:39 +02:00

futex

printk: Change type of CONFIG_BASE_SMALL to bool

2024-05-06 17:39:09 +02:00

gcov

gcov: add support for GCC 14

2024-06-15 10:43:06 -07:00

irq

genirq/irqdesc: Honor caller provided affinity in alloc_desc()

2024-08-14 15:34:32 +02:00

kcsan

kcsan, compiler_types: Introduce __data_racy type qualifier

2024-05-07 11:39:50 -07:00

livepatch

livepatch: Rename KLP_* to KLP_TRANSITION_*

2024-05-09 15:48:01 +02:00

locking

locking/pvqspinlock: Correct the type of "old" variable in pv_kick_node()

2024-08-14 15:33:59 +02:00

module

module: make waiting for a concurrent module loader interruptible

2024-08-14 15:34:25 +02:00

power

vfs-6.10-rc2.fixes

2024-05-27 08:09:12 -07:00

printk

printk/panic: Allow cpu backtraces to be written into ringbuffer during panic

2024-08-29 17:35:53 +02:00

rcu

rcu: Fix rcu_barrier() VS post CPUHP_TEARDOWN_CPU invocation

2024-08-14 15:34:07 +02:00

sched

sched/core: Fix unbalance set_rq_online/offline() in sched_cpu_deactivate()

2024-08-14 15:34:35 +02:00

time

timekeeping: Fix bogus clock_was_set() invocation in do_adjtimex()

2024-08-14 15:34:30 +02:00

trace

tracing: Return from tracing_buffers_read() if the file has been closed

2024-08-29 17:35:39 +02:00

.gitignore

…

acct.c

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

async.c

async: Use a dedicated unbound workqueue with raised min_active

2024-02-09 11:13:59 -10:00

audit_fsnotify.c

…

audit_tree.c

fsnotify: create a wrapper fsnotify_find_inode_mark()

2024-04-04 16:24:16 +02:00

audit_watch.c

fsnotify: create a wrapper fsnotify_find_inode_mark()

2024-04-04 16:24:16 +02:00

audit.c

audit: use KMEM_CACHE() instead of kmem_cache_create()

2024-01-25 10:12:22 -05:00

audit.h

…

auditfilter.c

ima: Avoid blocking in RCU read-side critical section

2024-06-13 14:26:50 -04:00

auditsc.c

audit,io_uring: io_uring openat triggers audit reference count underflow

2023-10-13 18:34:46 +02:00

backtracetest.c

backtracetest: Convert from tasklet to BH workqueue

2024-02-05 13:22:34 -10:00

bounds.c

bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS

2024-04-29 08:29:29 -07:00

capability.c

lsm: constify the 'target' parameter in security_capget()

2023-08-08 16:48:47 -04:00

cfi.c

…

compat.c

…

configs.c

…

context_tracking.c

context_tracking: Make context_tracking_key __ro_after_init

2024-03-22 11:18:18 +01:00

cpu_pm.c

…

cpu.c

cpu/SMT: Enable SMT only if a core is online

2024-08-29 17:35:52 +02:00

crash_core.c

Mainly singleton patches, documented in their respective changelogs.

2024-05-19 14:02:03 -07:00

crash_reserve.c

crash: add prefix for crash dumping messages

2024-05-08 08:41:26 -07:00

cred.c

cred: Use KMEM_CACHE() instead of kmem_cache_create()

2024-02-23 17:33:31 -05:00

delayacct.c

delayacct: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:54 +02:00

dma.c

…

elfcorehdr.c

crash: remove dependency of FA_DUMP on CRASH_DUMP

2024-02-23 17:48:22 -08:00

exec_domain.c

…

exit.c

mm: optimize the redundant loop of mm_update_owner_next()

2024-07-03 12:29:24 -07:00

exit.h

exit: add internal include file with helpers

2023-09-21 12:03:50 -06:00

extable.c

…

fail_function.c

…

fork.c

pidfd: prevent creation of pidfds for kthreads

2024-08-29 17:35:44 +02:00

freezer.c

Linux 6.7-rc6

2023-12-23 15:52:13 +01:00

gen_kheaders.sh

kheaders: use command -v to test for existence of cpio

2024-05-30 01:13:20 +09:00

groups.c

groups: Convert group_info.usage to refcount_t

2023-09-29 11:28:39 -07:00

hung_task.c

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

iomem.c

kernel/iomem.c: remove __weak ioremap_cache helper

2023-08-21 13:37:28 -07:00

irq_work.c

…

jump_label.c

jump_label: Fix the fix, brown paper bags galore

2024-08-14 15:34:00 +02:00

kallsyms_internal.h

kallsyms: get rid of code for absolute kallsyms

2024-08-29 17:35:50 +02:00

kallsyms_selftest.c

kallsyms: Match symbols exactly with CONFIG_LTO_CLANG

2024-08-29 17:35:51 +02:00

kallsyms_selftest.h

…

kallsyms.c

kallsyms: Match symbols exactly with CONFIG_LTO_CLANG

2024-08-29 17:35:51 +02:00

kcmp.c

file: convert to SLAB_TYPESAFE_BY_RCU

2023-10-19 11:02:48 +02:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.kexec

crash: clean up kdump related config items

2024-02-23 17:48:22 -08:00

Kconfig.locks

…

Kconfig.preempt

…

kcov.c

kcov: properly check for softirq context

2024-08-14 15:34:32 +02:00

kexec_core.c

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

kexec_elf.c

…

kexec_file.c

crash: add a new kexec flag for hotplug support

2024-04-23 14:59:01 +10:00

kexec_internal.h

crash: remove dependency of FA_DUMP on CRASH_DUMP

2024-02-23 17:48:22 -08:00

kexec.c

crash: add a new kexec flag for hotplug support

2024-04-23 14:59:01 +10:00

kheaders.c

…

kprobes.c

kprobes: Fix to check symbol prefixes correctly

2024-08-14 15:34:22 +02:00

ksyms_common.c

…

ksysfs.c

vmlinux: Avoid weak reference to notes section

2024-05-02 19:48:26 +09:00

kthread.c

kunit: Handle test faults

2024-05-06 14:22:02 -06:00

latencytop.c

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

Makefile

crash: split crash dumping code out from kexec_core.c

2024-02-23 17:48:22 -08:00

module_signature.c

…

notifier.c

…

nsproxy.c

pidfd: add pidfs

2024-03-01 12:23:37 +01:00

numa.c

kernel/numa.c: Move logging out of numa.h

2023-12-20 19:26:30 -05:00

padata.c

padata: Fix possible divide-by-0 panic in padata_mt_helper()

2024-08-14 15:34:33 +02:00

panic.c

printk/panic: Allow cpu backtraces to be written into ringbuffer during panic

2024-08-29 17:35:53 +02:00

params.c

params: Fix multi-line comment style

2023-12-01 09:51:44 -08:00

pid_namespace.c

Revert "rcu-tasks: Fix synchronize_rcu_tasks() VS zap_pid_ns_processes()"

2024-08-14 15:34:05 +02:00

pid_sysctl.h

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

pid.c

pidfs: remove config option

2024-03-13 12:53:53 -07:00

profile.c

profiling: remove profile=sleep support

2024-08-14 15:34:17 +02:00

ptrace.c

ptrace_attach: shift send(SIGSTOP) into ptrace_set_stopped()

2024-02-22 15:38:52 -08:00

range.c

…

reboot.c

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

regset.c

regset: use kvzalloc() for regset_get_alloc()

2024-04-25 21:07:03 -07:00

relay.c

kernel: relay: remove relay_file_splice_read dead code, doesn't work

2023-12-29 12:22:27 -08:00

resource_kunit.c

…

resource.c

Quite a lot of kexec work this time around. Many singleton patches in

2024-01-09 11:46:20 -08:00

rseq.c

…

scftorture.c

…

scs.c

…

seccomp.c

sysctl changes for v6.10-rc1

2024-05-17 17:31:24 -07:00

signal.c

kernel: rerun task_work while freezing in get_signal()

2024-08-03 09:00:31 +02:00

smp.c

CSD lock commits for v6.7

2023-10-30 17:56:53 -10:00

smpboot.c

kthread: add kthread_stop_put

2023-10-04 10:41:57 -07:00

smpboot.h

…

softirq.c

softirq: Fix suspicious RCU usage in __do_softirq()

2024-04-29 05:03:51 +02:00

stackleak.c

sysctl changes for v6.10-rc1

2024-05-17 17:31:24 -07:00

stacktrace.c

stacktrace: fix kernel-doc typo

2023-12-29 12:22:29 -08:00

static_call_inline.c

…

static_call.c

…

stop_machine.c

…

sys_ni.c

syscalls: fix compat_sys_io_pgetevents_time64 usage

2024-06-25 15:57:20 +02:00

sys.c

RISC-V Patches for the 6.10 Merge Window, Part 1

2024-05-22 09:56:00 -07:00

sysctl-test.c

…

sysctl.c

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

task_work.c

task_work: Introduce task_work_cancel() again

2024-08-03 09:00:36 +02:00

taskstats.c

taskstats: fill_stats_for_tgid: use for_each_thread()

2023-10-04 10:41:57 -07:00

torture.c

torture: Print out torture module parameters

2023-09-24 17:24:01 +02:00

tracepoint.c

…

tsacct.c

…

ucount.c

sysctl changes for v6.10-rc1

2024-05-17 17:31:24 -07:00

uid16.c

…

uid16.h

…

umh.c

umh: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

up.c

smp: Change function signatures to use call_single_data_t

2023-09-13 14:59:24 +02:00

user_namespace.c

user_namespace: remove unnecessary NULL values from kbuf

2024-02-22 15:38:52 -08:00

user-return-notifier.c

…

user.c

printk: Change type of CONFIG_BASE_SMALL to bool

2024-05-06 17:39:09 +02:00

usermode_driver.c

…

utsname_sysctl.c

kernel misc: Remove the now superfluous sentinel elements from ctl_table array

2024-04-24 09:43:53 +02:00

utsname.c

…

vhost_task.c

vhost_task: Handle SIGKILL by flushing work and exiting

2024-05-22 08:31:15 -04:00

vmcore_info.c

kallsyms: get rid of code for absolute kallsyms

2024-08-29 17:35:50 +02:00

watch_queue.c

watch_queue: fix kcalloc() arguments order

2023-12-21 13:17:54 +01:00

watchdog_buddy.c

…

watchdog_perf.c

watchdog/perf: properly initialize the turbo mode timestamp and rearm counter

2024-08-03 09:00:54 +02:00

watchdog.c

Mainly singleton patches, documented in their respective changelogs.

2024-05-19 14:02:03 -07:00

workqueue_internal.h

workqueue: Drop the special locking rule for worker->flags and worker_pool->flags

2023-08-07 15:57:22 -10:00

workqueue.c

workqueue: Always queue work items to the newest PWQ for order workqueues

2024-08-03 09:00:31 +02:00